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A core ingredient for the bomb which ripped through the government buildings in Oslo, Norway last Friday was bought in Sweden, while the government has proposed a review of the sale of fertilizer, another ingredient in the bomb.

Anders Behring Breivik, the 32-year-old man who has admitted being responsible for the attacks which left over 70 people dead, personally collected 150 kilogrammes of aluminium powder from Schenkers terminal in Karlstad, according to the Göteborgs-Posten daily.

According to his terror manifesto, published shortly before the attacks, the aluminium powder is one of the ingredients in the manufacture of the type of homemade bomb which Behring Breivik is suspected of using during Friday's attack.

The powder is used, he wrote, to boost the bomb's explosive capacity.

According to Behring Breivik's manifesto he spent €240,000 ($347,300) on the attacks and despite not having any income to speak of. According to the Norwegian tax authorities he has declared a total income of only 5,223 kronor since 2006.

According to reports in the UK press a member of the extreme-right English Defence League (EDL) has admitted that the organisation had had contact with the man responsible for Norway's worst ever terrorist atrocity.

The Swedish government is meanwhile considering a review of the regulations governing the sale of fertilizer, one of the other main ingredients in the bomb.

"I think the rules need to be tightened. Then the events in Norway highlight the issue, that makes you see how important it is that steps are taken in the area," justice minister Beatrice Ask told Sveriges Radio (SR).

The ammonium nitrate is the active ingredient in fertilizer which can be used for making explosives when put together with fuel and a detonator.

The combination has been used by, among others the Taliban in Afghanistan and the Oklahoma bomber.